G709中文翻译学习

1ScopeTheopticaltransporthierarchy(OTH)supportstheoperationandmanagementaspectsofopticalnetworksofvariousarchitectures,e.g.,point-to-point,ringandmesharchitectures.ThisRecommendationdefinestheinterfacesoftheopticaltransportnetworktobeusedwithinandbetweensubnetworksoftheopticalnetwork,intermsof:–opticaltransporthierarchy(OTH)–functionalityoftheoverheadinsupportofmulti-wavelengthopticalnetworks–framestructures–bitrates–formatsformappingclientsignals.光传送体系（OTH）支持不同架构的光网络的运营和管理，例如，点对点，环形和网状架构。该协议依据如下维度定义了光网络的接口的标准，该接口用于光网络子网内部及子网之间的通信。-光传送体系（OTH）-支持多波光网络的开销的功能-帧结构-Bit率-客户信号映射格式TheinterfacesdefinedinthisRecommendationcanbeappliedatuser-to-networkinterfaces(UNI)andnetworknodeinterfaces(NNI)oftheopticaltransportnetwork.Itisrecognized,forinterfacesusedwithinopticalsubnetworks,thataspectsoftheinterfaceareopticaltechnologydependentandsubjecttochangeastechnologyprogresses.Therefore,opticaltechnologydependentaspects(fortransversecompatibility)arenotdefinedfortheseinterfacestoallowfortechnologychanges.Theoverheadfunctionalitynecessaryforoperationsandmanagementofopticalsubnetworksisdefined.协议定义的接口，可以应用于光传送网络的用户网络接口（UNI）和网络节点接口（NNI）。对于光网络的子网的接口应用，某些方面是受限于科技进步的。所以，依赖于光科技的方面（横向兼容方面）是没有被定义的，从而允许随着科技进步进行改变。光网络子网操作及管理需要的开销功能同样被定义。ThesecondrevisionofthisRecommendationintroduced:–supportforanextended(unlimited)setofconstantbitrateclientsignals;–aflexibleODUk,whichcanhaveanybitrateandabit-ratetoleranceupto100ppm;–aclient/serverindependentgenericmappingproceduretomapaclientsignalintothepayloadofanOPUk,ortomapanODUjsignalintothepayloadofoneormoretributaryslotsinanOPUk;–ODUkdelaymeasurementcapability.第二次修订的协议介绍了：-支持一种扩展的CBR客户信号；-ODUkflex，可以是任意bit率，bit率最大容忍100ppm；-一种客户层与服务层独立的通用映射（GMP）步骤，将客户信号映射到OPUk的净和区，或者将一个ODUj信号映射到一个OPUk的一个或多个时隙的净和区；-ODUk的延迟测量能力。ThethirdrevisionofthisRecommendationintroducesthetextofAmendments1and2,Corrigendum1andErratum1toRecommendationITU-TG.709/Y.1331(2009)andsupportformoreclientsignals.第三次修订的协议将修订1和2的文本，勘误表1和勘误1合入协议ITU-TG.709/Y.1331(2009)，并支持更多的客户侧信号。2ReferencesThefollowingITU-TRecommendationsandotherreferencescontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthisRecommendation.Atthetimeofpublication,theeditionsindicatedwerevalid.AllRecommendationsandotherreferencesaresubjecttorevision;usersofthisRecommendationarethereforeencouragedtoinvestigatethepossibilityofapplyingthemostrecenteditionoftheRecommendationsandotherreferenceslistedbelow.AlistofthecurrentlyvalidITU-TRecommendationsisregularlypublished.ThereferencetoadocumentwithinthisRecommendationdoesnotgiveit,asastand-alonedocument,thestatusofaRecommendation.本协议有以下ITU-T协议以及其他参考包含的条款构成。在出版时，所示版本声明已经有效。所有协议集其他参考条款都以此版本为准；鼓励这个协议的用户，访问以下协议及参考的最新版本。协议清单会规律地发布。本协议引用的参考文献还还没有给出，作为一个独立重要的文件。[ITU-TG.652]RecommendationITU-TG.652(2009),Characteristicsofasingle-modeopticalfibreandcable.单模光纤和光缆的特性[ITU-TG.653]RecommendationITU-TG.653(2006),Characteristicsofadispersion-shiftedsingle-modeopticalfibreandcable.色散位移单模光纤和光缆的特性。[ITU-TG.655]RecommendationITU-TG.655(2009),Characteristicsofanon-zerodispersion-shiftedsingle-modeopticalfibreandcable.[ITU-TG.693]RecommendationITU-TG.693(2009),Opticalinterfacesforintra-officesystems.[ITU-TG.695]RecommendationITU-TG.695(2009),Opticalinterfacesforcoarsewavelengthdivisionmultiplexingapplications.[ITU-TG.707]RecommendationITU-TG.707/Y.1322(2003),Networknodeinterfaceforthesynchronousdigitalhierarchy(SDH).[ITU-TG.780]RecommendationITU-TG.780/Y.1351(2008),Termsanddefinitionsforsynchronousdigitalhierarchy(SDH)networks.[ITU-TG.798]RecommendationITU-TG.798(2006),Characteristicsofopticaltransportnetworkhierarchyequipmentfunctionalblocks.[ITU-TG.805]RecommendationITU-TG.805(2000),Genericfunctionalarchitectureoftransportnetworks.[ITU-TG.806]RecommendationITU-TG.806(2009),Characteristicsoftransportequipment–Descriptionmethodologyandgenericfunctionality.[ITU-TG.870]RecommendationITU-TG.870/Y.1352(2004),Termsanddefinitionsforopticaltransportnetworks(OTN).[ITU-TG.872]RecommendationITU-TG.872(2001),Architectureofopticaltransportnetworks.[ITU-TG.873.1]RecommendationITU-TG.873.1(2006),OpticalTransportNetwork(OTN):Linearprotection.[ITU-TG.873.2]RecommendationITU-TG.873.2(2012),ODUksharedringprotection(SRP).[ITU-TG.959.1]RecommendationITU-TG.959.1(2009),Opticaltransportnetworkphysicallayerinterfaces.[ITU-TG.984.6]RecommendationITU-TG.984.6(2008),Gigabit-capablepassiveopticalnetworks(GPON):Reachextension.[ITU-TG.987.4]RecommendationITU-TG.987.4(2012),10Gigabit-capablepassiveopticalnetworks(XG-PON):Reachextension.[ITU-TG.7041]RecommendationITU-TG.7041/Y.1303(2003),Genericframingprocedure(GFP).[ITU-TG.7042]RecommendationITU-TG.7042/Y.1305(2001),Linkcapacityadjustmentscheme(LCAS)forvirtualconcatenatedsignals.[ITU-TG.7044]RecommendationITU-TG.7044/Y.1347(2011),HitlessAdjustmentofODUflex(GFP).[ITU-TG.7714.1]RecommendationITU-TG.7714.1/Y.1705.1(2010),ProtocolforautomaticdiscoveryinSDHandOTNnetworks.[ITU-TG.8011.1]RecommendationITU-TG.8011.1/Y.1307.1(2009),Ethernetprivatelineservice.[ITU-TI.432.1]RecommendationITU-TI.432.1(1999),B-ISDNuser-n